Concrete form



J. H. DUNCAN ET AL CONCRETE FORM Filed July 13, 1922 2 Sheets-Sheet l u/EN 7013 ,S

Patented July 22, 1924,

NlTE

1,502,092 FICE.

CONCRETE FORM.

Application filed July 13, 1922, Serial No. 574,616.

To all whom it may concern:

' Be'f it known that we, JAMES H. DUNoAN' and SYDNEY Roeow, both citizens of the United States, residing at the city of New York, borough of Manhattan, county and Stateof New York, have invented certain new and useful Concrete Forms, of which the following is a specification. 1

This'invention is a concrete form, the sam being adapted for use, more particularly, in molding joists, beams or girders, and the slabs of concrete flooring in buildings during the erection thereof, although our concrete form, or parts thereof, may be used for molding concrete in other structures.

In molding concrete for the formation of floor sl abs with integral joists, beams or girders it is desirable to secure rapidity in the erection of the form by unskilled labor; to provide for the expeditious removal of the slab forming members independently by the removal of the joist forming members; to enable the several members to be assembled in a manner to provide for a variation in the relative spacing of said members to the end that the joists or beams may be molded at a desirable distance one from the other, or said members may be assembled to mold the beams or joists to attain a desirable depth, and to employ a relatively few parts each of simple and stable construction and possessing the requisite strength and stifl'ness to withstand comparatively rough usage repeatedly.

According to this invention, the form embodies joist-formingmembers of a desirable cross section, slab-forming members supported by the joist-forming members either directly or indirectly, and soifit members positioned intermediate the joist-forming members, each of said members being composed, preferably, of metal, and said members be-ing assembled t attainadjust-ability in the relation of the joist-formingmembers to each other, and a desirable adjustability of the soflit members to the joistforming members, and a similar adjustability of the slab-forming members to the joist-forming members, all as will be hereinafter described.

Other functions and advantages of the invention will appear from the following description taken in connection with the drawings illustrating two practical embodiments of the invention, wherein-- Figure 1 is an elevation partly in section illustrating one embodiment of the invention, the plane of the section being indicated by the dotted line 1- 1of Figure 2 looking in the direction of the arrow.

Figure 2 is a vertical transverse section taken in the plane of the dotted line 2-2 of Figure 1.

Figure 3 is a vertical section taken in the plane of the dotted line 33 of Figure 5 illustrating another embodiment of the invention.

Figure 4 is a vertical cross section on the line 44.- of Figure 3 looking in the direction of the arrow; and

Figure 5 is a plan view of F i ures 3 and 4, with parts broken away an in dotted lines for illustrating the stretchers by which the slab-forming, members are supported by suspending said stretchers from the joist-forming member's.

Referring to Figures 1 and 2 of the drawings, the joist-forms are'composed of members A, B, C, and the slab-forms are comprised of a desirable number of members D, supported directly by the joist-form members A, B For simplicity and durability, each joist-forming member A or B is composed of metal of a desirable shape in cross section, said member A or B comprising a steel plate or sheet of appropriate length and width, and said plate being provided at the top edge with a longitudinal flange a and at the bottom edge with a similar (longitudinal) flange b. As shown, the flange a is directed outwardly, whereas flange b is directed inwardly with respect to the joistforming mold, the result of which formation a of member A or B is to impart an approximately Z-shape in cross section to each mem her, which formation imparts a desirable stability or stifi'ness to the member and produces a mold p-art possessing great strength whereby simplicity of the joist mold is obtained and a desirable decrease in the cost of the under framing or shoring is secured. The members A and B- are positioned in parallel side by side relation, with the bottom flanges b 6 extending inwardly with respect to the intermediate joist molding cavity, said members being joined by detachable fastening means herein shown as transverse bolts E extending through bolt holes e provided in members A'B. Said members by reason of their strength and stiffness am desirably made of considerable length, and each member A or B is positioned in lapping planks and are positioned for contact with relation to another similar member, the overlap between the end portions of two similar members B B being indicated in dotted lines at b in Figure 1, whereby provision is made for molding concrete joists of a desirable length, and provision is made, also, for a desirable variation in the length of said joist for the reason that the sides of the joist form may be lengthened or shortened by assembling the members with more or less overlap at the meeting end portions as indicated at b in Figure 1 in connection with members B B, as will be readily understood.

The joist-forming members A B are sup: ported by planks F F set up edgewise, which planks in connection with posts F constitute the under framing or shoring. The planks F are positioned at the ends of the span for supporting the end portions of members -A B-adjacent the wall, Whereas the planks F are positioned below the lapping portions b of the joist members intermediate the span. The members are assembled for the flanged lower edges 6 to rest directly upon the planks, and if desired to be nailed or otherwise fastened thereto. As shown, the lanks are applied sidewise to the posts, belng nailed thereto, and the planks are stiflened by resting upon cleats f which are nailed to the posts below the the under edges of said planks, see Figures -1 and 2.

The bolt apertures e are provided at suitable intervals in the length of joist-forming members A B, and it is preferable to employ these apertures in vertical series as shown in Figures 1 and 2 whereby the bolts E maybe raised or lowered with reference to the members A B.

" The sofit members C of each joist moldable material, but for strength and dura-' bility said member C is composed of metal of channeled form in cross section. Said sofit members G are positioned intermediate the members A B and above the foot flanges Zr thereof, so as to have contact with the 1nner faces of said members, whereby the sofit members constitute the bottom of the joist molding cavity and they act as spreaders or separators for precluding any tendency of members A B to collapse inwardly. Said sofit members C rest upon and are supported by cross bolts E, and these sofit members with the cross bolts may be raised or lowered by fitting the bolts in different apertures e of the vertical series in order to attain a desirable variation in the depth of the joist to be molded when ouring the concrete. Obviously, members A B may be spaced apart according to a desirable thickness of the joist, see Figures 2 and A, and in this cormeetlon it will be noted that .SOflit aeoaoea which are turned down to form flanges 02'.

The slab members are assembled for the end portions thereof to overlap as at d in Figure 1, whereas the flanges 03 take or hook over the top ed es of the members A B, see Figure 2, where y the members D are easily and quickly assembled in the required relation to the joist-members A B so as to be supported directly thereby, said members D presenting a continuous surface and forming the bottom of the slab molding cavit Said slab molding members are considerab y shorter than the joist molding members, so that a series of such members are used in connection with each pair of joist-forming members A B, the decreased length of members D enabling said members to be handled with ease and facility and providing for the assemblage of a number of these parts to make up the bottom of the slab mold.

The constructional form of the invention illustrated in Figures 3 to 5, inclusive, embodies the components of the joist-molding members A B, thesofiit members G supported by bolts E fitted in vertical series of apertures e, and a plurality of slab-forming members; but in this form of construction the slab-forming members are not fitted directly to or interlocked with the joistforming members A B; on the contrary, said slab-forming members are supported indirectly from members A B by interposing certain supporting or suspending devices between the slab-forming members Gr and the members A B. The aforesaid suspending devices H are shown as comprising a pair of parallel bare it 72/ provided with apertures 11 adapted to receive bolts l by which the bars are fixedly secured to ether in a manner to provide for a desirab e extensible adjustment of the suspending device, whereby said device may be increased or decrease in length according to the width of the slab and the dimensions in one direction of the slab molding members G. The parallel bars h h are spaced relatively to each other by interposed spacers j to leave an intervening space into which are fitted the flanges 9 provided on the slabforming members Gr by bending the edges thereof. Said supports H are positioned crosswise of the members A B at suitable intervals in the length thereof, and these supports H are suspended from the mem bers A B by means of hangers K, shown aslltlll) hangers being looped around the end portions of the rails h It composing the supports H. Said Supports are near the upper edges of the members A B, from which the supports are suspended by said hangers K, and these supports are constructed to receive in the slots is the flanges g of the slabforming members G, whereby said members G are assembled for the flanges g to be locked in the slotted supports so as to be retained or held against displacement and to be supported fixedly in position.

Members G are assembled to run lengthwise of the members A B and to be overlapped at their meeting edges as at g at or about the middle of the slab, see Figures 4 and 5; but at their side edges'these members G extend below the top flanges a a of the members A B, see Figure 4, so as to underlap the latter, whereas the flanged edges 9 are locked by fitting said flanges g in the slots is of the cross supports H. By suspending the supports H from the flanged edges a of the members A B, and by supporting-the slab-forming members G on the supports H so that said members G have underlapping relation to the members A B, the slab-forming members G are held in place indirectly by the members A B, as a' result of which organization the members G with the supports H may be removed or dismounted independently of the members A B C, whereby the parts G H may be taken down and utilized in the formation of other false work, whereas the parts A B C are allowed to remain in position for a desirable length of time to the end that the concrete material of the joists may become set or hardened as required.

As is usual, the space intervening the members A Bat the ends of the joist mold cavity is closed by the use of an end cap J.

The mode of using the knock-down form for molding the joists and slabs of concrete material will be apparent from the foregoing description taken in connection with the drawings. The under framing or shoring is erected as usual, the Z-shaped members A B are positioned on the planks, the cross bolts E and soilit members C are assembled, and the slab-formin members D or G are placed in the require positions, after which the concrete is poured. as usual.

In this invention the mold for the joists or beams is composed of side members A B each of a cross sectional form to attain a desirable stiffness and stren th, as a result of which the mold is simplifi edby reducing the number of parts, and said mold is adapted for use in connection with an under framing or shoring of decreased cost. By lapping the end portions of the members A B and supporting said lapped portions by the shoring, it is possible to attain a desirable variation in the length of the joist or beam to be produced. By bolting the Z-shaped members A B together, and utilizin a soifit member between these members A it is possible to raise or lower the soflit members to mold joists or members of desired depths. side members A B provide for securing a desirable flexibility or adjustability in assembling so as to space the joists or beams on centers at different distances apart, for the reason that the strength and stability of the members A B enable said members to be used in spans Which vary in length or width.

Having thus fully described the invention, what we claim as new and desire to secure by Letters Patent is:

l. A concrete form of the class described embodying a plurality of joist molding members positioned in side by side relation, each member being a continuous plate and provided at the lower edge thereof with a laterally extending flange, shoring planks extending transversely to said joist molding members and upon which planks rest the flanged lower edges of said joist molding members, a soflEit member separate from the joist molding members and between the same intermediate the depth thereof, and slab molding members positioned in lapping relation to each other and in a similar relation to the joist molding members, said joist molding members operating to carry said slab molding members independently of said planks.

2. A concrete form of the class described embodying a plurality of joist molding members positioned in side by side relation, each joist molding member being a continuous plate substantially Z-shaped in cross section a soflit member of channeled cross section, said soflit member being free fromdirect attachment to the joist molding members and positioned intermediate said members, bolts passing through said joist molding members and upon which bolts are imposed the flanged edges of said channeled sofiit member, and slab molding members carried by the joist molding members independently of the shoring for supporting the joist molding members.

3. A concrete form of the class described embodying joist molding members positioned in side by side relation, each joist molding member being a continuous plate substantially Z-shaped in cross section shoringthcrefor, a sofiit member extending between and carried by said joist moldingmembers, and slab molding members directly carried by said joist molding members independently of the shoring, said slab molding members being in lapping relation to each other.

4. A concrete form of the class described embodying joist molding members, each joist The use of the Z-shaped molding member bein a continuous plate substantially Z-shape in cross section a shoring therefor, a soffit member co-operable with said joist molding members, and slab molding members carried by said joist molding members independently of the shoring, said slab molding members being assembled in lapping relation to each other and positioned in direct engagement with ed thereby independent of the shoring, and

a soflit member intermediate the joist molding members.

6. A concrete form of the class described embodying joist molding members, a shoring therefor, a sofiit member co-operable with said joist molding members, and flanged slab molding members positioned in direct engagement with the upper marginal portions of said joist molding members, said slab molding members being assembled in lapping relation to each other and supported directly by the joist molding members independently of the shoring.

7. A concrete form of the class described embodying pairs of metal side members, each side member. being a continuous plate of approximately Z-shaped in cross section, soflit members, and flanged slab-molding members spanning the spaces between adjacent pairs of side members, said flanged members being assembled in series and carried by the side members independently of the sofiit members.

8. A concrete form of the class described embodying joist molding members, a shoring therefor, a soflit member intermediate said joist molding members, and slab molding members carried direct-1y by joist molding members independently of said shoring, there being a plurality of slab molding members intermediate adjacent pairs of joist molding members and said slab molding members being assembled in lapping relation to each other.

9. A concrete form of the class described embodying joist-molding side members assembled in pairs, and supported directly by an under framing or shoring. slab-molding members spanning the spaces between adjacent pairs of side members, and supporting means for said slab-molding members, said supporting means being carried or supported by the side members independently of reoaoea the under framing or shoring and said supporting means belng demountable with the slab-molding members without disturbing the side members.

10. A concrete form of the class described embodying joist-molding side members assembled in pairs, supporting means positioned crosswise of the side members and carried thereby, and slab-molding members held by the supporting means and demountable without disturbing the side members.

11. A concrete form of the class described embodying joist-molding side members assembled in pairs, a plurality of slotted supporting members positioned crosswise of the side members and carried thereby, and a series of lapping slab-forming members in locked relation to the slotted supporting members.

12. A concrete form of the class described embodying joist-molding side members assembled in pairs, a plurality of slotted supporting members positioned crosswise of the side members and carried thereby, and a plurality of slab-molding members provided with flanges which co-operate with the slotted members for supporting the slabmolding members in locked relation to the supporting members.

13. A concrete form of the class described embodying joist-molding side members assembled in pairs, a plurality of extensible supporting members positioned transversely between the side members, means for suspending said supporting members from the side members, and slab-molding members resting on the supporting members and demountable without disturbing said side members.

14. A concrete form of the classdescribed embodying joist-molding side members assembled in pairs, a plurality of supporting members between the side members, hangers attached to the side members for suspending the supporting members, and slabmolding members carried by the supporting members in the span intervening the side members said supporting members and the slab molding members being demountable without disturbing said joist molding members.

15. A concrete form of the class described embodying joist-molding side members as- 'sYnNEY Roeow.

JAMES H. DUNCAN. 

